diff options
| author | Sam Protsenko <semen.protsenko@linaro.org> | 2022-07-14 19:55:47 +0300 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2022-07-15 10:30:44 +0200 |
| commit | 5f26ad58be8c0ca4dc8b13788a35e71b42cb3b4e (patch) | |
| tree | db3a486b29d3df668aa8f0287da0d36426358920 /drivers/iommu | |
| parent | fce398d2d02c0a9a2bedf7c7201b123e153e8963 (diff) | |
| download | lwn-5f26ad58be8c0ca4dc8b13788a35e71b42cb3b4e.tar.gz lwn-5f26ad58be8c0ca4dc8b13788a35e71b42cb3b4e.zip | |
iommu/exynos: Set correct dma mask for SysMMU v5+
SysMMU v5+ supports 36 bit physical address space. Set corresponding DMA
mask to avoid falling back to SWTLBIO usage in dma_map_single() because
of failed dma_capable() check.
The original code for this fix was suggested by Marek.
Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Co-developed-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220714165550.8884-4-semen.protsenko@linaro.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/exynos-iommu.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c index 7058f08e8301..ca3656e18f25 100644 --- a/drivers/iommu/exynos-iommu.c +++ b/drivers/iommu/exynos-iommu.c @@ -646,6 +646,14 @@ static int exynos_sysmmu_probe(struct platform_device *pdev) } } + if (MMU_MAJ_VER(data->version) >= 5) { + ret = dma_set_mask(dev, DMA_BIT_MASK(36)); + if (ret) { + dev_err(dev, "Unable to set DMA mask: %d\n", ret); + goto err_dma_set_mask; + } + } + /* * use the first registered sysmmu device for performing * dma mapping operations on iommu page tables (cpu cache flush) @@ -657,6 +665,8 @@ static int exynos_sysmmu_probe(struct platform_device *pdev) return 0; +err_dma_set_mask: + iommu_device_unregister(&data->iommu); err_iommu_register: iommu_device_sysfs_remove(&data->iommu); return ret; |